Attachment-plug.



R. B. BENJAMIN.

ATTACHMENT PLUG.

APPLICATION flu-:n APR. 19. 1913.

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Patented J an. 11, 1916.

3 SHEETS-SHEET l.

R. B. BENIAMIN.

ATTACHMENT PLUG.

APPLICATION HLED APA. 19, wxs.

3 SHEETS-SHEET 2.

Patented Jan. 11, 1916.

R. B. BENJAMIN.

AT MENT PLUG.

APPL1cAT 111:1) A1 11.19. 1913.

Eatented Jan. 11, 1916.

3 SHEETS-SHEET 3 J www...

land exact description,

REUBEN B. BENJAMIN,

OF CHECAGO, ILLINOS, ASSIGNOR T0 BENJAMN ELEGTRC MANUFACTURING COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ATTACHMENT-PLUG.

Application filed April 19, 1913.

To all whom it 'may concern:

Be it known that I, REUBEN B. BENJAMIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Attachment-Plugs, of which the following is a full, clear, concise,

reference being had to the accompanying drawing, forming a part of this specification.

My invention pertains to attachment plugs, and especially relates to separable attachment plugsi. e., plugs of the kind which include an insertible member. adapted for insertion into a wall socket or the like and a bindinglterminal carrying member separably connected with the insertible member.

It is an object of my invention to provide a separable attachment plug of the above character which will be convenient and safe in use, which will be of a simple and durable construction, and ma'y be placed on the market at a low cost. l

1t is a further object of my invention to improve upon the details ot construction of attachment plugs. f

A separable attachment plug constructed in accordance with my invention is escribed, by way of example, in the following specification and shown in the accompanying drawings. It is to be understood, however, that my invention may be embodied in plugs of' other kinds than that described and shown, and that changes may be made in the construction which 1 lhave chosen as illustrating my invention, without exceeding the scope' of the invention as denecl in the appended claims.

In the drawings: Figure 1 shows a separable attachment plug constructed in accordance with my invention in longitudinal section; Fig. 2 is a plan of the upper end of the insertible member; Fig. 3 is a plan of the lower end of the insertible member; Fig. 4 is a plan ot the upper end of the binding-terminal carrying member; Fig. y5 is a plan of the lower end of the bindingterminal carrying member; Fig. 6 is a section on the line 6-6 of Fig. 1 looking in the direction of the arrows; Fig. 7, is a section on the line 77 of Fig` 1 looking in the direction of the arrows; Fig. 8 is a per- Specication of Letters Patent.

. spective view Patented dan.. 11, 19in.

senaino. 762,429.

of one of the forked contacts of the insertible member; Fig. 9 is a perspective view of one oi' the plunger contacts ot the binding-terminal carrying member; Fig. 10 is a perspective view of one of the retaining plates for the plunger contacts; Fig. 11 shows in longitudinal section a modified form of the insertible member; and Fig. 12 is a plan otl the upper end of the insertible member shown in Fig. 11.

Like reference characters refer to like parts throughout the following specification and the several figures of the accompanying drawing.

Referring now to the drawings, the insertible member comprises an insulating block 10. formed with an enlarged disk shaped head 11. The block 1() is formed with two downwardly opening chambers 12, each of which contains a forked contact adapted to be cngaged by a. plunger contact of the bindingterminal carrying member, each forked contact consists ota metallic strip bent to form a pair of resilient arms 13 connected at their upper ends by a transverse portion 14:. T he arms 13 terminate 4short of the mouths ot the openings 12, and one arm of each pair is rovided with a retaining projection 15 adapted to engage in a hole formed in the corresponding plunger contact of the binding-terminal carrying member. Mounted on the upper end of the insulating block 1() 17 which surrounds the top end of the block 10 so as to maintain the button and the block in axial alinement. The button 16 has a hole formed therethr ugh coaxial with one of the chambers 12. he hole receives the shank 1S of the center contact 19. rlhe shank 1S passes through an aperture in the transverse portion 14 of one ot the forked contacts and is riveted over within the forked Contact, whereby the forked contact and the center contact are secured in position and the insulating button 16 is secured to the insulating block button 1G is formed with a second aperture,

.is an insulating button 16 having a flange 10. The insulating coaxial with the second chamber 12, which ing this strip 22 against the bottom of a re with a head cess 23 formed in the upper end of the block 16. The `lower end of the connecting plate 2O passes through an aperture' in the transverse portion 14 of the forked contact and is riveted over within the forked contact, as clearly shown in Fig. 7, whereby the forked contact and the bent strip 22 are secured in position.

A cup-shaped conducting member 24 is mounted on the insulating block 10, and

rests on a shoulder 25 with which the latter is formed. The strip 22 is hooked, at 26, into the cup-shaped member 24 (Figs. 1 and 2), whereby electrical connection is established between the cup-shaped member 24and the forked contact which is retained in position by the connecting plate 20. The insulating button 16 is formed with a channel in the side thereof to provide room for the assage of the strip 22.

ounted on the insulating block 10 is a threaded contact 27. The lower end of the., contact 27 is flanged inwardly, at 28 so as to engage beneath the cup-shaped member 24 when the plug is inserted into a socket. An insulating thumb ring 29, adapted to be grasped when the threaded contact is to be screwed into or out of a socket, is secured to the lower end of the threaded contact.

The binding-terminal carrying member consists of an insulating base 30 having a peripheral iiange 31 extending upwardly therefrom, such flange being of sufficient diameter to inclose snugly the disk-shaped Lextension 11 of the insulating block 10 when the binding-terminal carrying member is attached to the insertible member. The base 30 is provided with two upwardly extending plunger contacts. These plunger contacts being of similar construction a description of one of them will suffice. Each plunger contact includes a fiat metallic strip 32 which lies in the bottom of a rectangular depression 33 formed in the upper surface of the base 30. Adjacent the end of the strip 32 which is located toward the center of the base 30, the strip is bent upward and back upon itself to form a V-shaped plunger 34. Beyond the plunger 34, the plate is bent to form a lug 35 which lies in the bottom of the recess 33. The V-shaped plunger 34 has formed therein a hole 36 for receiving the retaining projection l5 of the correspondupward through the base 30, enters th? tongue 40, and thereby secures the retaining plate 39 in position, the retaining plate thus clamping the strip 32 against the bottom of the recess 33. The retaining plate is provided with a binding screw 42, to which access may be had by means of a channel 43 leading to an aperture 44 extending downble portion, it is possible to insert the complete plug into a socket without twisting the conductors. The construction has the further advantage that the portion of the insertible member which carries the forked contacts can be locked in any desired p osition. When the binding-terminal carrying member is removed from theinsertible member, the forked contacts are isolated from each other in such a manner that it would be exceedingly difficult for them to be accident-v ally bridged or for a person@ to receive a shock by touching both of them simultaneously. member may be attached to, or removed from, the insertible member with great ease; and the construction is such that the binding-terminal carrying member will be pulled automatically away from the insertible member in case of any considerable pull being accidentally applied to the conductors, regardless of whether such pull is in line with the axis of the plug or at an angle-thereto.

In cases where it is not desired to provide the insertible member with a rotatable threaded contact, the insertible member shown in Figs. 11 and 12 may be employed. The insertible member shown in the Figs. 11 and 12 consists of an insulating block 47 formed with a shoulder 48 and an annular iiange 49 which may be seized by the fingers when the insertible member is being screwed into or out of a socket. Below the fiange 49, the insulating block 47 is formed with a disk shaped extension 50 of a size to snugly fit within the flange 31 of the binding-terminal 'carrying member. The block 47 is formed with a pair of chambers 51, contain- Aing the forked contacts, these chambers and lfoi'ked contacts being similar to the chambers 12 and forked contacts described above. One of the forked contacts is held in position by means of the shank 52 of a center The binding-terminal carrying4 ics contact 53 in a manner similar to that inA which the shank 18 of the center contact 19 holds the corresponding forked contact in position.

A threaded contact 54 surrounds the upper part of the block 47 above and rests upon the shoulder 48. The threaded contact 54 is1 provided with an inwardly extending flange 55 at its upper end, which flange is formed with a slot for receiving a small boss 56 extending upwardly from the block 47, thereby preventing relative rotation between the threaded contact 54 and the block 47 A portion of the flange 55 is enlarged at 57 so as to cover a considerable portion of the top end of the block 47. A securing plate 5.8 lies upon the enlarged portion 47 and 1s provided with a shank 59 which extends downwardly through a hole formed longitu. dinally in the block 47. The shank59 is riveted over within the'second forked contact. Thus the securing plate 58 makes electrical connection between the threaded contact 54 and one-of the'forked contacts, and at the same time, serves to secure the threaded contact against longitudinal withdrawal from the block 47 The insertible membershown in Figs. 11 and 12 is of an exceedingly simple and economical construction, and the parts of it may be assembled with great ease and speed. It is adapted to be used in connection with the binding-terminal carrying member described above, with reference to Figs. 1-10.

Having thus described my invention, what I claim as new and desire to secure by Let-4 ters Patent is: 1. In combination, an insulating base, a metallic .strip lying on said base and having a portion thereof bent upwardly and back upon itself to form a `V-shaped contact, a retaining plate having a tongue extending through the base of said V-shaped contact, the contact being provided with portions for engaging withsaid tongue and said insulating base betweenthe two, and means located in thesame plane as said V-shaped contact for securing said retaining plate in position;

2. In' a separable attachment plug, an insulating member, a substantially U-shaped contact having the portion between its arms secured against said member and its arms free from and spaced awayfrom said mem-- ber, a second insulating member, a substantially V-shaped Contact secured to said second insulating member with the divergent ends of its arms against said second member, the convergent ends of said V-shaped contact extending between and engaging the arms of the U-shaped contact.

3. In a separable attachment plug, an insulating member, a substantially U-shaped contact having the portion between its arms secured against said member and its arms free from and spaced away from said member, a second insulating member, a substantially V-shaped contact secured to said second insulating member with the divergent ends of itsarms against said second'member, the convergent ends. of saidv V-shaped contact extending between and engaging the arms of the U-shaped contact, one of said engaging arms being provided with an apsaid apertures, and means for securing said member to said base.

5. In combination, an insulating base, a

substantially V-shaped contact having an aperture in each arm thereof, a retaining member of conducting material extending through both of said apertures, a binding terminal engaging said retaining member, nd means for securing said member `to said ase.

6. In combination, a substantially V- shaped contact having an opening in each arm thereof, said openings being distant from the apex of the V, a member of conducting material extending through both of sa1d openings, and a binding terminal engagmg said member.

7. A separable attachment plug comprising an insulating base having an aperture therethrough, a substantially Ushaped contact of sheet material having lan'aperture in the part connectingthe two arms registering with the first said aperture, and a retaining member of sheet conducting material passing through'both apertures, said retaining member having a part extending over the edge of the aperture in the U-shaped memltaining member lying substantially in parallel lanes.

8. n a separable attachment plug, an insulatin'g button having an aperture there-4 through offset from'the axis thereof, a contact tongue of sheet material having an aperture therethrough in registry with the first said aperture, an.l.-shaped conducting memaber of sheet material having one arm extending through both said apertures, and the other arm extending from said offset aper- 20 ture toward the axis of the button, and means for securing said contact -to said member, said tongue and the arm of the member -which extends through said apertures lying substantially in 'arallel lanes.

9. In a separa le attac ment plug, an insulating button having'an aperture therethrough oset from the axis thereof, an insulating member having anaperture in registry with said first aperture, a contact hav- With said first and secoiid apertures, an L` `l .In Witness whereof, I have hereunto Sub-.2 shaped conducting member having one arm scribed my name in the preseneexofvtwo' Witextending through` allbf said apertures and nesses. f

. Athe other extending from said Offset aperture j 1 "l VREBEN B. BENJAMIN. 5' toward the axis O f the button, and means for Witnesses; i

securing said insulating member and con- CHARLES G. COPE,

tact to said L-shaped member. ANNE SOLOMON. copiers of this'I patent may be btained for ave cents each, by lma'rf-,ssing-,f the com missioner of Twents,- Washington, D. 6. 

